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DOI: https://doi.org/10.11988/ckyyb.20250004

Influence of Mainshock-Aftershock Sequence on Nonlinear Seismic Response of Hollow Gravity Dam

  • YAO Hui-qin , 1, 2 ,
  • JING Feng-xiao 2 ,
  • HE Wei-ping , 1, 2 ,
  • LIU Cong-yu 2
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  • 1. Hubei Key Laboratory of Construction and Management in Hydropower Engineering, China Three Gorges University, Yichang 443002, China
  • 2. College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang 443002, China

Received date: 2025-01-03

  Revised date: 2025-04-15

  Online published: 2025-06-03

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Abstract

To evaluate the anti-seismic safety of the hollow gravity dam, the nonlinear seismic response under the mainshock-aftershock sequences is investigated. First, the mainshock-aftershock sequence is built by the combination of records from the PEER. The finite element model of a hollow gravity dam is established with the Concrete Damage Plastic model simulating the concrete and the Westerguarrd method simulating the hydrodynamic pressure from the reservoir. Then the nonlinear seismic response of the hollow gravity dam is calculated under several mainshock-aftershock sequences. Finally, the nonlinear seismic response of the hollow gravity dam is evaluated in aspects of the damaged area, the residual deformation, and the damage dissipation energy. The results show that the aftershock causes significant additional damage to the hollow gravity dam, which is mainly the extension of the damage area caused by the mainshock. When the peak ratio of the aftershock and the mainshock is 0.8526, the residual deformation caused by three aftershocks accounts for 23.9%, 24.4%, and 26.1% of the total value, respectively. The damage dissipation energy caused by three aftershocks accounted for 38.8%, 49.6%, and 47.1% of the total value, respectively. The results prove the essential of considering the influence of aftershocks in the anti-seismic safety evaluation of hollow gravity dams.

Key words： mainshock-aftershock sequence; hollow gravity dam; concrete damage plastic model; failure process; residual deformation; damage dissipation energy

Cite this article

YAO Hui-qin , JING Feng-xiao , HE Wei-ping , LIU Cong-yu . Influence of Mainshock-Aftershock Sequence on Nonlinear Seismic Response of Hollow Gravity Dam[J]. Journal of Changjiang River Scientific Research Institute, 2025 . DOI: 10.11988/ckyyb.20250004

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